| 摘要 |
PURPOSE:To detect effectively a current induced in a car body due to a broadcast wave by providing a high frequency pickup incorporating an impedance matching circuit and an amplifier circuit to the peripheral of a car body. CONSTITUTION:The high frequency pickup 38 is arranged closely to the peripheral of a rear window frame 34. The peripheral of the said frame 34 has a high current density induced by the broadcast wave. Then the impedance matching circuit and the amplifier circuit are contained incorporatedly as a circuit section 58 in a case 40 of the pickup 80. Further, the output impedance of the amplifier circuit and the characteristic impedance of an antenna coaxial cable 60 are matched. Then the current induced in the car body due to the broadcast wave is detected effectively. |
